头部增厚法在中厚板轧制过程中的应用

分析扭振在道次轧制中的变化特点,得知头部咬入阶段的峰值扭矩是制约道次压下量的关键因素.结合整个轧制过程的稳态轧制扭矩的变化规律,提出在展宽阶段和伸长阶段前几个道次采用头部增厚法,即在咬入阶段后的稳态轧制过程适当增加道次压下量.并推导出轧制扭矩和压下量的关系式,得到道次压下量的放大范围.该方法能在不改动轧机设备的前提下提高轧机能力,适合在中厚板轧机上进行推广使用.

Application of Workpiece Head Thickening Method in Plate Rolling Process

Based on the analysis of the change in torque during plate rolling with respect to each pass reduction, it is known that the peak torque occurring in the biting phase of workpiece head is the key factor to restrain the pass reduction. In view of how the steady-state rolling torque changes in the whole rolling process, the workpiece head thickening method is proposed for the early pass reductions in both spread and elongation rolling phases, i. e. , the pass reduction is increased properly during steady-state rolling after the biting phase. Then a relational expression of rolling torque and pass reduction is derived, by which the reduction is given. The method proposed can effectively improve the capacity of rolling mills without reform the existing rolling system. It is therefore applicable to plate mills.